Added Summit build instructions

- Init file: configuring TNQVM (amplitude calculation mode). QCOR stack on Summit. Execution with MPI (showing GPU flops after calculation)

- Submit a job to QLM via a simple `-qpu` switch.

## Summit Build Instructions

### Modules

```

module load gcc/10.2.0 cmake/3.20.2 python/3.7.0 openblas/0.3.9-omp

```

### LLVM CSP Build

```

cmake ../llvm -DCMAKE_INSTALL_PREFIX=~/.llvm -DCMAKE_C_COMPILER=/sw/summit/gcc/10.2.0/bin/gcc -DCMAKE_CXX_COMPILER=/sw/summit/gcc/10.2.0/bin/g++ -DLLVM_ENABLE_PROJECTS="clang;mlir" -DBUILD_SHARED_LIBS=TRUE

```

### QCOR Build

```

cmake .. -DXACC_DIR=~/.xacc -DLLVM_ROOT=~/.llvm -DMLIR_DIR=~/.llvm/lib/cmake/mlir -DQCOR_BUILD_TESTS=TRUE -DCMAKE_BUILD_TYPE=Debug -DQCOR_EXTRA_HEADERS="/sw/summit/gcc/10.2.0/include/c++/10.2.0/powerpc64le-unknown-linux-gnu/;/sw/summit/gcc/10.2.0/include/c++/10.2.0/"

```

### Using QCOR

For some reason, Clang-CSP on Summit failed to link against libc++ loaded by module load (gcc/10.2).

Hence, we need to separate the QCOR compilation to two phases: (1) compile with qcor (-c) then (2) using g++ to link.

```

qcor -c file_name.cpp

```

```

g++ -rdynamic -Wl,-rpath,/ccs/home/nguyent/.xacc/lib:/ccs/home/nguyent/.xacc/lib:/autofs/nccs-svm1_home1/nguyent/.llvm/lib:/ccs/home/nguyent/.xacc/clang-plugins -L /ccs/home/nguyent/.xacc/lib -lqcor -lqrt -lqcor-hybrid -lqcor-quasimo -lqcor-jit -L /ccs/home/nguyent/.xacc/lib -lxacc -lCppMicroServices -lxacc-quantum-gate -lxacc-pauli -lxacc-fermion -lpthread -lqir-qrt file_name.o

```

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